code: def ucb_score(v, i):
      m = mean(v)
      stat = (1 + np.sqrt(np.log(3.0 + i))) / np.sqrt(len(v))
      return m - stat
  
file_path: nevergrad/docs/instrumentations_examples.py
imports: import numpy
  import sys
  from joblib import Parallel, delayed
  from collections import defaultdict
  import nevergrad
  import signal
label_desc: Use image node_id 2 for calling a global function with example usage: ucb_score(v, i) and returns: unknown